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'use strict';

var Scalar = require('../../nodes/Scalar.js');

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

exports.nullTag = nullTag;