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Filename : twemoji.js
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/*jslint indent: 2, browser: true, bitwise: true, plusplus: true */
var twemoji = (function (
  /*! Copyright Twitter Inc. and other contributors. Licensed under MIT *//*
    https://github.com/jdecked/twemoji/blob/gh-pages/LICENSE
  */

  // WARNING:   this file is generated automatically via
  //            `node scripts/build.js`
  //            please update its `createTwemoji` function
  //            at the bottom of the same file instead.

) {
  'use strict';

  /*jshint maxparams:4 */

  var
    // the exported module object
    twemoji = {


    /////////////////////////
    //      properties     //
    /////////////////////////

      // default assets url, by default will be jsDelivr CDN
      base: 'https://cdn.jsdelivr.net/gh/jdecked/twemoji@16.0.1/assets/',

      // default assets file extensions, by default '.png'
      ext: '.png',

      // default assets/folder size, by default "72x72"
      // available via jsDelivr: 72
      size: '72x72',

      // default class name, by default 'emoji'
      className: 'emoji',

      // basic utilities / helpers to convert code points
      // to JavaScript surrogates and vice versa
      convert: {

        /**
         * Given an HEX codepoint, returns UTF16 surrogate pairs.
         *
         * @param   string  generic codepoint, i.e. '1F4A9'
         * @return  string  codepoint transformed into utf16 surrogates pair,
         *          i.e. \uD83D\uDCA9
         *
         * @example
         *  twemoji.convert.fromCodePoint('1f1e8');
         *  // "\ud83c\udde8"
         *
         *  '1f1e8-1f1f3'.split('-').map(twemoji.convert.fromCodePoint).join('')
         *  // "\ud83c\udde8\ud83c\uddf3"
         */
        fromCodePoint: fromCodePoint,

        /**
         * Given UTF16 surrogate pairs, returns the equivalent HEX codepoint.
         *
         * @param   string  generic utf16 surrogates pair, i.e. \uD83D\uDCA9
         * @param   string  optional separator for double code points, default='-'
         * @return  string  utf16 transformed into codepoint, i.e. '1F4A9'
         *
         * @example
         *  twemoji.convert.toCodePoint('\ud83c\udde8\ud83c\uddf3');
         *  // "1f1e8-1f1f3"
         *
         *  twemoji.convert.toCodePoint('\ud83c\udde8\ud83c\uddf3', '~');
         *  // "1f1e8~1f1f3"
         */
        toCodePoint: toCodePoint
      },


    /////////////////////////
    //       methods       //
    /////////////////////////

      /**
       * User first: used to remove missing images
       * preserving the original text intent when
       * a fallback for network problems is desired.
       * Automatically added to Image nodes via DOM
       * It could be recycled for string operations via:
       *  $('img.emoji').on('error', twemoji.onerror)
       */
      onerror: function onerror() {
        if (this.parentNode) {
          this.parentNode.replaceChild(createText(this.alt, false), this);
        }
      },

      /**
       * Main method/logic to generate either <img> tags or HTMLImage nodes.
       *  "emojify" a generic text or DOM Element.
       *
       * @overloads
       *
       * String replacement for `innerHTML` or server side operations
       *  twemoji.parse(string);
       *  twemoji.parse(string, Function);
       *  twemoji.parse(string, Object);
       *
       * HTMLElement tree parsing for safer operations over existing DOM
       *  twemoji.parse(HTMLElement);
       *  twemoji.parse(HTMLElement, Function);
       *  twemoji.parse(HTMLElement, Object);
       *
       * @param   string|HTMLElement  the source to parse and enrich with emoji.
       *
       *          string              replace emoji matches with <img> tags.
       *                              Mainly used to inject emoji via `innerHTML`
       *                              It does **not** parse the string or validate it,
       *                              it simply replaces found emoji with a tag.
       *                              NOTE: be sure this won't affect security.
       *
       *          HTMLElement         walk through the DOM tree and find emoji
       *                              that are inside **text node only** (nodeType === 3)
       *                              Mainly used to put emoji in already generated DOM
       *                              without compromising surrounding nodes and
       *                              **avoiding** the usage of `innerHTML`.
       *                              NOTE: Using DOM elements instead of strings should
       *                              improve security without compromising too much
       *                              performance compared with a less safe `innerHTML`.
       *
       * @param   Function|Object  [optional]
       *                              either the callback that will be invoked or an object
       *                              with all properties to use per each found emoji.
       *
       *          Function            if specified, this will be invoked per each emoji
       *                              that has been found through the RegExp except
       *                              those follwed by the invariant \uFE0E ("as text").
       *                              Once invoked, parameters will be:
       *
       *                                iconId:string     the lower case HEX code point
       *                                                  i.e. "1f4a9"
       *
       *                                options:Object    all info for this parsing operation
       *
       *                                variant:char      the optional \uFE0F ("as image")
       *                                                  variant, in case this info
       *                                                  is anyhow meaningful.
       *                                                  By default this is ignored.
       *
       *                              If such callback will return a falsy value instead
       *                              of a valid `src` to use for the image, nothing will
       *                              actually change for that specific emoji.
       *
       *
       *          Object              if specified, an object containing the following properties
       *
       *            callback   Function  the callback to invoke per each found emoji.
       *            base       string    the base url, by default twemoji.base
       *            ext        string    the image extension, by default twemoji.ext
       *            size       string    the assets size, by default twemoji.size
       *
       * @example
       *
       *  twemoji.parse("I \u2764\uFE0F emoji!");
       *  // I <img class="emoji" draggable="false" alt="❤️" src="/assets/2764.gif"/> emoji!
       *
       *
       *  twemoji.parse("I \u2764\uFE0F emoji!", function(iconId, options) {
       *    return '/assets/' + iconId + '.gif';
       *  });
       *  // I <img class="emoji" draggable="false" alt="❤️" src="/assets/2764.gif"/> emoji!
       *
       *
       * twemoji.parse("I \u2764\uFE0F emoji!", {
       *   size: 72,
       *   callback: function(iconId, options) {
       *     return '/assets/' + options.size + '/' + iconId + options.ext;
       *   }
       * });
       *  // I <img class="emoji" draggable="false" alt="❤️" src="/assets/72x72/2764.png"/> emoji!
       *
       */
      parse: parse,

      /**
       * Given a string, invokes the callback argument
       *  per each emoji found in such string.
       * This is the most raw version used by
       *  the .parse(string) method itself.
       *
       * @param   string    generic string to parse
       * @param   Function  a generic callback that will be
       *                    invoked to replace the content.
       *                    This callback will receive standard
       *                    String.prototype.replace(str, callback)
       *                    arguments such:
       *  callback(
       *    rawText,  // the emoji match
       *  );
       *
       *                    and others commonly received via replace.
       */
      replace: replace,

      /**
       * Simplify string tests against emoji.
       *
       * @param   string  some text that might contain emoji
       * @return  boolean true if any emoji was found, false otherwise.
       *
       * @example
       *
       *  if (twemoji.test(someContent)) {
       *    console.log("emoji All The Things!");
       *  }
       */
      test: test
    },

    // used to escape HTML special chars in attributes
    escaper = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      "'": '&#39;',
      '"': '&quot;'
    },

    // RegExp based on emoji's official Unicode standards
    // http://www.unicode.org/Public/UNIDATA/EmojiSources.txt
    re = 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c\udffd\u200d\ud83e\udd1d\u200d\ud83e\uddd1\ud83c[\udffb-\udfff]|\ud83e\uddd1\ud83c\udffe\u200d\u2764\ufe0f\u200d\ud83e\uddd1\ud83c[\udffb-\udffd\udfff]|\ud83e\uddd1\ud83c\udffe\u200d\ud83e\udd1d\u200d\ud83e\uddd1\ud83c[\udffb-\udfff]|\ud83e\uddd1\ud83c\udfff\u200d\u2764\ufe0f\u200d\ud83e\uddd1\ud83c[\udffb-\udffe]|\ud83e\uddd1\ud83c\udfff\u200d\ud83e\udd1d\u200d\ud83e\uddd1\ud83c[\udffb-\udfff]|\ud83d\udc68\u200d\u2764\ufe0f\u200d\ud83d\udc8b\u200d\ud83d\udc68|\ud83d\udc69\u200d\u2764\ufe0f\u200d\ud83d\udc8b\u200d\ud83d[\udc68\udc69]|\ud83e\udef1\ud83c\udffb\u200d\ud83e\udef2\ud83c[\udffc-\udfff]|\ud83e\udef1\ud83c\udffc\u200d\ud83e\udef2\ud83c[\udffb\udffd-\udfff]|\ud83e\udef1\ud83c\udffd\u200d\ud83e\udef2\ud83c[\udffb\udffc\udffe\udfff]|\ud83e\udef1\ud83c\udffe\u200d\ud83e\udef2\ud83c[\udffb-\udffd\udfff]|\ud83e\udef1\ud83c\udfff\u200d\ud83e\udef2\ud83c[\udffb-\udffe]|\ud83d\udc68\u200d\u2764\ufe0f\u200d\ud83d\udc68|\ud83d\udc69\u200d\u2764\ufe0f\u200d\ud83d[\udc68\udc69]|\ud83e\uddd1\u200d\ud83e\udd1d\u200d\ud83e\uddd1|\ud83d\udc6b\ud83c[\udffb-\udfff]|\ud83d\udc6c\ud83c[\udffb-\udfff]|\ud83d\udc6d\ud83c[\udffb-\udfff]|\ud83d\udc8f\ud83c[\udffb-\udfff]|\ud83d\udc91\ud83c[\udffb-\udfff]|\ud83e\udd1d\ud83c[\udffb-\udfff]|\ud83d[\udc6b-\udc6d\udc8f\udc91]|\ud83e\udd1d)|(?:\ud83d[\udc68\udc69]|\ud83e\uddd1)(?:\ud83c[\udffb-\udfff])?\u200d(?:\u2695\ufe0f|\u2696\ufe0f|\u2708\ufe0f|\ud83c[\udf3e\udf73\udf7c\udf84\udf93\udfa4\udfa8\udfeb\udfed]|\ud83d[\udcbb\udcbc\udd27\udd2c\ude80\ude92]|\ud83e[\uddaf-\uddb3\uddbc\uddbd])(?:\u200d\u27a1\ufe0f)?|(?:\ud83c[\udfcb\udfcc]|\ud83d[\udd74\udd75]|\u26f9)((?:\ud83c[\udffb-\udfff]|\ufe0f)\u200d[\u2640\u2642]\ufe0f(?:\u200d\u27a1\ufe0f)?)|(?:\ud83c[\udfc3\udfc4\udfca]|\ud83d[\udc6e\udc70\udc71\udc73\udc77\udc81\udc82\udc86\udc87\ude45-\ude47\ude4b\ude4d\ude4e\udea3\udeb4-\udeb6]|\ud83e[\udd26\udd35\udd37-\udd39\udd3d\udd3e\uddb8\uddb9\uddcd-\uddcf\uddd4\uddd6-\udddd])(?:\ud83c[\udffb-\udfff])?\u200d[\u2640\u2642]\ufe0f(?:\u200d\u27a1\ufe0f)?|(?:\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83e\uddd1\u200d\ud83e\uddd1\u200d\ud83e\uddd2\u200d\ud83e\uddd2|\ud83d\udc68\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83e\uddd1\u200d\ud83e\uddd1\u200d\ud83e\uddd2|\ud83e\uddd1\u200d\ud83e\uddd2\u200d\ud83e\uddd2|\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f|\ud83c\udff3\ufe0f\u200d\ud83c\udf08|\ud83d\ude36\u200d\ud83c\udf2b\ufe0f|\u26d3\ufe0f\u200d\ud83d\udca5|\u2764\ufe0f\u200d\ud83d\udd25|\u2764\ufe0f\u200d\ud83e\ude79|\ud83c\udf44\u200d\ud83d\udfeb|\ud83c\udf4b\u200d\ud83d\udfe9|\ud83c\udff4\u200d\u2620\ufe0f|\ud83d\udc15\u200d\ud83e\uddba|\ud83d\udc26\u200d\ud83d\udd25|\ud83d\udc3b\u200d\u2744\ufe0f|\ud83d\udc41\u200d\ud83d\udde8|\ud83d\udc68\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83d\udc6f\u200d\u2640\ufe0f|\ud83d\udc6f\u200d\u2642\ufe0f|\ud83d\ude2e\u200d\ud83d\udca8|\ud83d\ude35\u200d\ud83d\udcab|\ud83d\ude42\u200d\u2194\ufe0f|\ud83d\ude42\u200d\u2195\ufe0f|\ud83e\udd3c\u200d\u2640\ufe0f|\ud83e\udd3c\u200d\u2642\ufe0f|\ud83e\uddd1\u200d\ud83e\uddd2|\ud83e\uddde\u200d\u2640\ufe0f|\ud83e\uddde\u200d\u2642\ufe0f|\ud83e\udddf\u200d\u2640\ufe0f|\ud83e\udddf\u200d\u2642\ufe0f|\ud83d\udc08\u200d\u2b1b|\ud83d\udc26\u200d\u2b1b)|[#*0-9]\ufe0f?\u20e3|(?:[©®\u2122\u265f]\ufe0f)|(?:\ud83c[\udc04\udd70\udd71\udd7e\udd7f\ude02\ude1a\ude2f\ude37\udf21\udf24-\udf2c\udf36\udf7d\udf96\udf97\udf99-\udf9b\udf9e\udf9f\udfcd\udfce\udfd4-\udfdf\udff3\udff5\udff7]|\ud83d[\udc3f\udc41\udcfd\udd49\udd4a\udd6f\udd70\udd73\udd76-\udd79\udd87\udd8a-\udd8d\udda5\udda8\uddb1\uddb2\uddbc\uddc2-\uddc4\uddd1-\uddd3\udddc-\uddde\udde1\udde3\udde8\uddef\uddf3\uddfa\udecb\udecd-\udecf\udee0-\udee5\udee9\udef0\udef3]|[\u203c\u2049\u2139\u2194-\u2199\u21a9\u21aa\u231a\u231b\u2328\u23cf\u23ed-\u23ef\u23f1\u23f2\u23f8-\u23fa\u24c2\u25aa\u25ab\u25b6\u25c0\u25fb-\u25fe\u2600-\u2604\u260e\u2611\u2614\u2615\u2618\u2620\u2622\u2623\u2626\u262a\u262e\u262f\u2638-\u263a\u2640\u2642\u2648-\u2653\u2660\u2663\u2665\u2666\u2668\u267b\u267f\u2692-\u2697\u2699\u269b\u269c\u26a0\u26a1\u26a7\u26aa\u26ab\u26b0\u26b1\u26bd\u26be\u26c4\u26c5\u26c8\u26cf\u26d1\u26d3\u26d4\u26e9\u26ea\u26f0-\u26f5\u26f8\u26fa\u26fd\u2702\u2708\u2709\u270f\u2712\u2714\u2716\u271d\u2721\u2733\u2734\u2744\u2747\u2757\u2763\u2764\u27a1\u2934\u2935\u2b05-\u2b07\u2b1b\u2b1c\u2b50\u2b55\u3030\u303d\u3297\u3299])(?:\ufe0f|(?!\ufe0e))|(?:(?:\ud83c[\udfcb\udfcc]|\ud83d[\udd74\udd75\udd90]|\ud83e\udef0|[\u261d\u26f7\u26f9\u270c\u270d])(?:\ufe0f|(?!\ufe0e))|(?:\ud83c\udfc3|\ud83d\udeb6|\ud83e\uddce)(?:\ud83c[\udffb-\udfff])?(?:\u200d\u27a1\ufe0f)?|(?:\ud83c[\udf85\udfc2\udfc4\udfc7\udfca]|\ud83d[\udc42\udc43\udc46-\udc50\udc66-\udc69\udc6e\udc70-\udc78\udc7c\udc81-\udc83\udc85-\udc87\udcaa\udd7a\udd95\udd96\ude45-\ude47\ude4b-\ude4f\udea3\udeb4\udeb5\udec0\udecc]|\ud83e[\udd0c\udd0f\udd18-\udd1c\udd1e\udd1f\udd26\udd30-\udd39\udd3d\udd3e\udd77\uddb5\uddb6\uddb8\uddb9\uddbb\uddcd\uddcf\uddd1-\udddd\udec3-\udec5\udef1-\udef8]|[\u270a\u270b]))(?:\ud83c[\udffb-\udfff])?|(?:\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc73\udb40\udc63\udb40\udc74\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc77\udb40\udc6c\udb40\udc73\udb40\udc7f|\ud83c\udde6\ud83c[\udde8-\uddec\uddee\uddf1\uddf2\uddf4\uddf6-\uddfa\uddfc\uddfd\uddff]|\ud83c\udde7\ud83c[\udde6\udde7\udde9-\uddef\uddf1-\uddf4\uddf6-\uddf9\uddfb\uddfc\uddfe\uddff]|\ud83c\udde8\ud83c[\udde6\udde8\udde9\uddeb-\uddee\uddf0-\uddf7\uddfa-\uddff]|\ud83c\udde9\ud83c[\uddea\uddec\uddef\uddf0\uddf2\uddf4\uddff]|\ud83c\uddea\ud83c[\udde6\udde8\uddea\uddec\udded\uddf7-\uddfa]|\ud83c\uddeb\ud83c[\uddee-\uddf0\uddf2\uddf4\uddf7]|\ud83c\uddec\ud83c[\udde6\udde7\udde9-\uddee\uddf1-\uddf3\uddf5-\uddfa\uddfc\uddfe]|\ud83c\udded\ud83c[\uddf0\uddf2\uddf3\uddf7\uddf9\uddfa]|\ud83c\uddee\ud83c[\udde8-\uddea\uddf1-\uddf4\uddf6-\uddf9]|\ud83c\uddef\ud83c[\uddea\uddf2\uddf4\uddf5]|\ud83c\uddf0\ud83c[\uddea\uddec-\uddee\uddf2\uddf3\uddf5\uddf7\uddfc\uddfe\uddff]|\ud83c\uddf1\ud83c[\udde6-\udde8\uddee\uddf0\uddf7-\uddfb\uddfe]|\ud83c\uddf2\ud83c[\udde6\udde8-\udded\uddf0-\uddff]|\ud83c\uddf3\ud83c[\udde6\udde8\uddea-\uddec\uddee\uddf1\uddf4\uddf5\uddf7\uddfa\uddff]|\ud83c\uddf4\ud83c\uddf2|\ud83c\uddf5\ud83c[\udde6\uddea-\udded\uddf0-\uddf3\uddf7-\uddf9\uddfc\uddfe]|\ud83c\uddf6\ud83c\udde6|\ud83c\uddf7\ud83c[\uddea\uddf4\uddf8\uddfa\uddfc]|\ud83c\uddf8\ud83c[\udde6-\uddea\uddec-\uddf4\uddf7-\uddf9\uddfb\uddfd-\uddff]|\ud83c\uddf9\ud83c[\udde6\udde8\udde9\uddeb-\udded\uddef-\uddf4\uddf7\uddf9\uddfb\uddfc\uddff]|\ud83c\uddfa\ud83c[\udde6\uddec\uddf2\uddf3\uddf8\uddfe\uddff]|\ud83c\uddfb\ud83c[\udde6\udde8\uddea\uddec\uddee\uddf3\uddfa]|\ud83c\uddfc\ud83c[\uddeb\uddf8]|\ud83c\uddfd\ud83c\uddf0|\ud83c\uddfe\ud83c[\uddea\uddf9]|\ud83c\uddff\ud83c[\udde6\uddf2\uddfc]|\ud83c[\udccf\udd8e\udd91-\udd9a\udde6-\uddff\ude01\ude32-\ude36\ude38-\ude3a\ude50\ude51\udf00-\udf20\udf2d-\udf35\udf37-\udf7c\udf7e-\udf84\udf86-\udf93\udfa0-\udfc1\udfc5\udfc6\udfc8\udfc9\udfcf-\udfd3\udfe0-\udff0\udff4\udff8-\udfff]|\ud83d[\udc00-\udc3e\udc40\udc44\udc45\udc51-\udc65\udc6a\udc6f\udc79-\udc7b\udc7d-\udc80\udc84\udc88-\udc8e\udc90\udc92-\udca9\udcab-\udcfc\udcff-\udd3d\udd4b-\udd4e\udd50-\udd67\udda4\uddfb-\ude44\ude48-\ude4a\ude80-\udea2\udea4-\udeb3\udeb7-\udebf\udec1-\udec5\uded0-\uded2\uded5-\uded7\udedc-\udedf\udeeb\udeec\udef4-\udefc\udfe0-\udfeb\udff0]|\ud83e[\udd0d\udd0e\udd10-\udd17\udd20-\udd25\udd27-\udd2f\udd3a\udd3c\udd3f-\udd45\udd47-\udd76\udd78-\uddb4\uddb7\uddba\uddbc-\uddcc\uddd0\uddde-\uddff\ude70-\ude7c\ude80-\ude89\ude8f-\udec2\udec6\udece-\udedc\udedf-\udee9]|[\u23e9-\u23ec\u23f0\u23f3\u267e\u26ce\u2705\u2728\u274c\u274e\u2753-\u2755\u2795-\u2797\u27b0\u27bf\ue50a])|\ufe0f/g,

    // avoid runtime RegExp creation for not so smart,
    // not JIT based, and old browsers / engines
    UFE0Fg = /\uFE0F/g,

    // avoid using a string literal like '\u200D' here because minifiers expand it inline
    U200D = String.fromCharCode(0x200D),

    // used to find HTML special chars in attributes
    rescaper = /[&<>'"]/g,

    // nodes with type 1 which should **not** be parsed
    shouldntBeParsed = /^(?:iframe|noframes|noscript|script|select|style|textarea)$/,

    // just a private shortcut
    fromCharCode = String.fromCharCode;

  return twemoji;


  /////////////////////////
  //  private functions  //
  //     declaration     //
  /////////////////////////

  /**
   * Shortcut to create text nodes
   * @param   string  text used to create DOM text node
   * @return  Node  a DOM node with that text
   */
  function createText(text, clean) {
    return document.createTextNode(clean ? text.replace(UFE0Fg, '') : text);
  }

  /**
   * Utility function to escape html attribute text
   * @param   string  text use in HTML attribute
   * @return  string  text encoded to use in HTML attribute
   */
  function escapeHTML(s) {
    return s.replace(rescaper, replacer);
  }

  /**
   * Default callback used to generate emoji src
   *  based on jsDelivr CDN
   * @param   string    the emoji codepoint string
   * @param   string    the default size to use, i.e. "36x36"
   * @return  string    the image source to use
   */
  function defaultImageSrcGenerator(icon, options) {
    return ''.concat(options.base, options.size, '/', icon, options.ext);
  }

  /**
   * Given a generic DOM nodeType 1, walk through all children
   * and store every nodeType 3 (#text) found in the tree.
   * @param   Element a DOM Element with probably some text in it
   * @param   Array the list of previously discovered text nodes
   * @return  Array same list with new discovered nodes, if any
   */
  function grabAllTextNodes(node, allText) {
    var
      childNodes = node.childNodes,
      length = childNodes.length,
      subnode,
      nodeType;
    while (length--) {
      subnode = childNodes[length];
      nodeType = subnode.nodeType;
      // parse emoji only in text nodes
      if (nodeType === 3) {
        // collect them to process emoji later
        allText.push(subnode);
      }
      // ignore all nodes that are not type 1, that are svg, or that
      // should not be parsed as script, style, and others
      else if (nodeType === 1 && !('ownerSVGElement' in subnode) &&
          !shouldntBeParsed.test(subnode.nodeName.toLowerCase())) {

        // WP start
        // Use doNotParse() callback if set.
        if ( twemoji.doNotParse && twemoji.doNotParse( subnode ) ) {
            continue;
        }
        // WP end

        grabAllTextNodes(subnode, allText);
      }
    }
    return allText;
  }

  /**
   * Used to both remove the possible variant
   *  and to convert utf16 into code points.
   *  If there is a zero-width-joiner (U+200D), leave the variants in.
   * @param   string    the raw text of the emoji match
   * @return  string    the code point
   */
  function grabTheRightIcon(rawText) {
    // if variant is present as \uFE0F
    return toCodePoint(rawText.indexOf(U200D) < 0 ?
      rawText.replace(UFE0Fg, '') :
      rawText
    );
  }

  /**
   * DOM version of the same logic / parser:
   *  emojify all found sub-text nodes placing images node instead.
   * @param   Element   generic DOM node with some text in some child node
   * @param   Object    options  containing info about how to parse
    *
    *            .callback   Function  the callback to invoke per each found emoji.
    *            .base       string    the base url, by default twemoji.base
    *            .ext        string    the image extension, by default twemoji.ext
    *            .size       string    the assets size, by default twemoji.size
    *
   * @return  Element same generic node with emoji in place, if any.
   */
  function parseNode(node, options) {
    var
      allText = grabAllTextNodes(node, []),
      length = allText.length,
      attrib,
      attrname,
      modified,
      fragment,
      subnode,
      text,
      match,
      i,
      index,
      img,
      rawText,
      iconId,
      src;
    while (length--) {
      modified = false;
      fragment = document.createDocumentFragment();
      subnode = allText[length];
      text = subnode.nodeValue;
      i = 0;
      while ((match = re.exec(text))) {
        index = match.index;
        if (index !== i) {
          fragment.appendChild(
            createText(text.slice(i, index), true)
          );
        }
        rawText = match[0];
        iconId = grabTheRightIcon(rawText);
        i = index + rawText.length;
        src = options.callback(iconId, options);
        if (iconId && src) {
          img = new Image();
          img.onerror = options.onerror;
          img.setAttribute('draggable', 'false');
          attrib = options.attributes(rawText, iconId);
          for (attrname in attrib) {
            if (
              attrib.hasOwnProperty(attrname) &&
              // don't allow any handlers to be set + don't allow overrides
              attrname.indexOf('on') !== 0 &&
              !img.hasAttribute(attrname)
            ) {
              img.setAttribute(attrname, attrib[attrname]);
            }
          }
          img.className = options.className;
          img.alt = rawText;
          img.src = src;
          modified = true;
          fragment.appendChild(img);
        }
        if (!img) fragment.appendChild(createText(rawText, false));
        img = null;
      }
      // is there actually anything to replace in here ?
      if (modified) {
        // any text left to be added ?
        if (i < text.length) {
          fragment.appendChild(
            createText(text.slice(i), true)
          );
        }
        // replace the text node only, leave intact
        // anything else surrounding such text
        subnode.parentNode.replaceChild(fragment, subnode);
      }
    }
    return node;
  }

  /**
   * String/HTML version of the same logic / parser:
   *  emojify a generic text placing images tags instead of surrogates pair.
   * @param   string    generic string with possibly some emoji in it
   * @param   Object    options  containing info about how to parse
   *
   *            .callback   Function  the callback to invoke per each found emoji.
   *            .base       string    the base url, by default twemoji.base
   *            .ext        string    the image extension, by default twemoji.ext
   *            .size       string    the assets size, by default twemoji.size
   *
   * @return  the string with <img tags> replacing all found and parsed emoji
   */
  function parseString(str, options) {
    return replace(str, function (rawText) {
      var
        ret = rawText,
        iconId = grabTheRightIcon(rawText),
        src = options.callback(iconId, options),
        attrib,
        attrname;
      if (iconId && src) {
        // recycle the match string replacing the emoji
        // with its image counter part
        ret = '<img '.concat(
          'class="', options.className, '" ',
          'draggable="false" ',
          // needs to preserve user original intent
          // when variants should be copied and pasted too
          'alt="',
          rawText,
          '"',
          ' src="',
          src,
          '"'
        );
        attrib = options.attributes(rawText, iconId);
        for (attrname in attrib) {
          if (
            attrib.hasOwnProperty(attrname) &&
            // don't allow any handlers to be set + don't allow overrides
            attrname.indexOf('on') !== 0 &&
            ret.indexOf(' ' + attrname + '=') === -1
          ) {
            ret = ret.concat(' ', attrname, '="', escapeHTML(attrib[attrname]), '"');
          }
        }
        ret = ret.concat('/>');
      }
      return ret;
    });
  }

  /**
   * Function used to actually replace HTML special chars
   * @param   string  HTML special char
   * @return  string  encoded HTML special char
   */
  function replacer(m) {
    return escaper[m];
  }

  /**
   * Default options.attribute callback
   * @return  null
   */
  function returnNull() {
    return null;
  }

  /**
   * Given a generic value, creates its squared counterpart if it's a number.
   *  As example, number 36 will return '36x36'.
   * @param   any     a generic value.
   * @return  any     a string representing asset size, i.e. "36x36"
   *                  only in case the value was a number.
   *                  Returns initial value otherwise.
   */
  function toSizeSquaredAsset(value) {
    return typeof value === 'number' ?
      value + 'x' + value :
      value;
  }


  /////////////////////////
  //  exported functions //
  //     declaration     //
  /////////////////////////

  function fromCodePoint(codepoint) {
    var code = typeof codepoint === 'string' ?
          parseInt(codepoint, 16) : codepoint;
    if (code < 0x10000) {
      return fromCharCode(code);
    }
    code -= 0x10000;
    return fromCharCode(
      0xD800 + (code >> 10),
      0xDC00 + (code & 0x3FF)
    );
  }

  function parse(what, how) {
    if (!how || typeof how === 'function') {
      how = {callback: how};
    }

    // WP start
    // Allow passing of the doNotParse() callback in the settings.
    // The callback is used in `grabAllTextNodes()` (DOM mode only) as a filter
    // that allows bypassing of some of the text nodes. It gets the current subnode as argument.
    twemoji.doNotParse = how.doNotParse;
    // WP end

    // if first argument is string, inject html <img> tags
    // otherwise use the DOM tree and parse text nodes only
    return (typeof what === 'string' ? parseString : parseNode)(what, {
      callback:   how.callback || defaultImageSrcGenerator,
      attributes: typeof how.attributes === 'function' ? how.attributes : returnNull,
      base:       typeof how.base === 'string' ? how.base : twemoji.base,
      ext:        how.ext || twemoji.ext,
      size:       how.folder || toSizeSquaredAsset(how.size || twemoji.size),
      className:  how.className || twemoji.className,
      onerror:    how.onerror || twemoji.onerror
    });
  }

  function replace(text, callback) {
    return String(text).replace(re, callback);
  }

  function test(text) {
    // IE6 needs a reset before too
    re.lastIndex = 0;
    var result = re.test(text);
    re.lastIndex = 0;
    return result;
  }

  function toCodePoint(unicodeSurrogates, sep) {
    var
      r = [],
      c = 0,
      p = 0,
      i = 0;
    while (i < unicodeSurrogates.length) {
      c = unicodeSurrogates.charCodeAt(i++);
      if (p) {
        r.push((0x10000 + ((p - 0xD800) << 10) + (c - 0xDC00)).toString(16));
        p = 0;
      } else if (0xD800 <= c && c <= 0xDBFF) {
        p = c;
      } else {
        r.push(c.toString(16));
      }
    }
    return r.join(sep || '-');
  }

}());