--- /dev/null
+'use strict';
+
+var common = require('../common');
+var Type = require('../type');
+
+function isHexCode(c) {
+ return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+ ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+ ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+}
+
+function isOctCode(c) {
+ return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+}
+
+function isDecCode(c) {
+ return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+}
+
+function resolveYamlInteger(data) {
+ if (data === null) return false;
+
+ var max = data.length,
+ index = 0,
+ hasDigits = false,
+ ch;
+
+ if (!max) return false;
+
+ ch = data[index];
+
+ // sign
+ if (ch === '-' || ch === '+') {
+ ch = data[++index];
+ }
+
+ if (ch === '0') {
+ // 0
+ if (index + 1 === max) return true;
+ ch = data[++index];
+
+ // base 2, base 8, base 16
+
+ if (ch === 'b') {
+ // base 2
+ index++;
+
+ for (; index < max; index++) {
+ ch = data[index];
+ if (ch === '_') continue;
+ if (ch !== '0' && ch !== '1') return false;
+ hasDigits = true;
+ }
+ return hasDigits;
+ }
+
+
+ if (ch === 'x') {
+ // base 16
+ index++;
+
+ for (; index < max; index++) {
+ ch = data[index];
+ if (ch === '_') continue;
+ if (!isHexCode(data.charCodeAt(index))) return false;
+ hasDigits = true;
+ }
+ return hasDigits;
+ }
+
+ // base 8
+ for (; index < max; index++) {
+ ch = data[index];
+ if (ch === '_') continue;
+ if (!isOctCode(data.charCodeAt(index))) return false;
+ hasDigits = true;
+ }
+ return hasDigits;
+ }
+
+ // base 10 (except 0) or base 60
+
+ for (; index < max; index++) {
+ ch = data[index];
+ if (ch === '_') continue;
+ if (ch === ':') break;
+ if (!isDecCode(data.charCodeAt(index))) {
+ return false;
+ }
+ hasDigits = true;
+ }
+
+ if (!hasDigits) return false;
+
+ // if !base60 - done;
+ if (ch !== ':') return true;
+
+ // base60 almost not used, no needs to optimize
+ return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
+}
+
+function constructYamlInteger(data) {
+ var value = data, sign = 1, ch, base, digits = [];
+
+ if (value.indexOf('_') !== -1) {
+ value = value.replace(/_/g, '');
+ }
+
+ ch = value[0];
+
+ if (ch === '-' || ch === '+') {
+ if (ch === '-') sign = -1;
+ value = value.slice(1);
+ ch = value[0];
+ }
+
+ if (value === '0') return 0;
+
+ if (ch === '0') {
+ if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+ if (value[1] === 'x') return sign * parseInt(value, 16);
+ return sign * parseInt(value, 8);
+ }
+
+ if (value.indexOf(':') !== -1) {
+ value.split(':').forEach(function (v) {
+ digits.unshift(parseInt(v, 10));
+ });
+
+ value = 0;
+ base = 1;
+
+ digits.forEach(function (d) {
+ value += (d * base);
+ base *= 60;
+ });
+
+ return sign * value;
+
+ }
+
+ return sign * parseInt(value, 10);
+}
+
+function isInteger(object) {
+ return (Object.prototype.toString.call(object)) === '[object Number]' &&
+ (object % 1 === 0 && !common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:int', {
+ kind: 'scalar',
+ resolve: resolveYamlInteger,
+ construct: constructYamlInteger,
+ predicate: isInteger,
+ represent: {
+ binary: function (object) { return '0b' + object.toString(2); },
+ octal: function (object) { return '0' + object.toString(8); },
+ decimal: function (object) { return object.toString(10); },
+ hexadecimal: function (object) { return '0x' + object.toString(16).toUpperCase(); }
+ },
+ defaultStyle: 'decimal',
+ styleAliases: {
+ binary: [ 2, 'bin' ],
+ octal: [ 8, 'oct' ],
+ decimal: [ 10, 'dec' ],
+ hexadecimal: [ 16, 'hex' ]
+ }
+});