--- /dev/null
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlNull(data) {
+ if (data === null) return true;
+
+ var max = data.length;
+
+ return (max === 1 && data === '~') ||
+ (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+}
+
+function constructYamlNull() {
+ return null;
+}
+
+function isNull(object) {
+ return object === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:null', {
+ kind: 'scalar',
+ resolve: resolveYamlNull,
+ construct: constructYamlNull,
+ predicate: isNull,
+ represent: {
+ canonical: function () { return '~'; },
+ lowercase: function () { return 'null'; },
+ uppercase: function () { return 'NULL'; },
+ camelcase: function () { return 'Null'; }
+ },
+ defaultStyle: 'lowercase'
+});