import { Scalar } from '../../nodes/Scalar.mjs';

const nullTag = {
  identify: value => value == null,
  createNode: () => new Scalar(null),
  default: true,
  tag: 'tag:yaml.org,2002:null',
  test: /^(?:~|[Nn]ull|NULL)?$/,
  resolve: () => new Scalar(null),
  stringify: ({
    source
  }, ctx) => typeof source === 'string' && nullTag.test.test(source) ? source : ctx.options.nullStr
};

export { nullTag };
