code: function(css) {
      return css.replace(this.fieldRegexAll, function(match, fieldName) {
        if (this.templateSnakeCase) {
          fieldName = fieldName.toLowerCase().replace(/-/g, '_');
        }
        return this.templateOpen + fieldName + this.templateClose;
      }.bind(this));
    }
docs: Replaces parsed field identifiers into template interpolations.
  Example: "____color-primary____" >> "<%= @color_primary %>"
  This method is intended to run on rendered CSS containing parsed fields.
  @param {String} css string to find and replace parsed fields within.
  @returns {String} the rendered string with fields formatted as interpolations.