code: function () {
                  var entities = this.entities;
  
                  return this.comment() || entities.literal() || entities.variable() || entities.url() ||
                      entities.property() || entities.call() || entities.keyword() || this.mixin.call(true) ||
                      entities.javascript();
              }
docs: Entities are the smallest recognized token, and can be found inside a rule's value.