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(function (extension) {
  'use strict';
  // UML - Universal Module Loader
  // This enables the extension to be loaded in different environments
  if (typeof showdown !== 'undefined') {
    // global (browser or nodejs global)
    extension(showdown);
  } else if (typeof define === 'function' && define.amd) {
    // AMD
    define(['showdown'], extension);
  } else if (typeof exports === 'object') {
    // Node, CommonJS-like
    module.exports = extension(require('showdown'));
  } else {
    // showdown was not found so we throw
    throw Error('Could not find showdown library');
  }
}(function (showdown) {
  'use strict';
  // Initialize a showdown converter to be used in the extension core
  var converter = new showdown.Converter();
  // The following method will register the extension with showdown
  showdown.extension('classify', function () {
    var x = 0;
    var ext = {
      type: 'lang',
      filter: function(text, converter, options) {
        var classNAMES = text.match(/\[(.*)--]/g),
            newText = text;
        if ((x < 3) && (classNAMES != null)) {
          ++x;
          for (var i = 0; i < classNAMES.length; i++) {
            var classNAME = classNAMES[i].match(/\[(.*)--]/)[1];
            if (classNAME != '') {
              var regex = new RegExp("\\["+classNAME+"--]([\\s\\S]*)\\[--"+classNAME+"]"),
                  textSPLIT = newText.match(regex);
              if (textSPLIT != null) {
                var textSNIPPET = textSPLIT[1],
                    html = converter.makeHtml(textSNIPPET);
                newText = newText.replace(regex, '<div class="'+classNAME+'">'+html+'</div>');
              }
            }
          }
        }
        x = 0;
        return newText;
      }
    };
    return [ext];
  });
}));