From dc2227b7180f4a4dfd743ba6d693fb7106e0c2a7 Mon Sep 17 00:00:00 2001
From: Vitaly Puzrin <vitaly@rcdesign.ru>
Date: Mon, 5 Mar 2018 18:36:32 +0300
Subject: [PATCH] Dumper: fix negative integers in bin/octal/hex formats, close
 #399

---
 lib/js-yaml/type/int.js |  9 +++++----
 test/issues/0399.js     | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+), 4 deletions(-)
 create mode 100644 test/issues/0399.js

diff --git a/lib/js-yaml/type/int.js b/lib/js-yaml/type/int.js
index 4ae522a5..ba61c5f9 100644
--- a/lib/js-yaml/type/int.js
+++ b/lib/js-yaml/type/int.js
@@ -157,10 +157,11 @@ module.exports = new Type('tag:yaml.org,2002:int', {
   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(); }
+    binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
+    octal:       function (obj) { return obj >= 0 ? '0'  + obj.toString(8) : '-0'  + obj.toString(8).slice(1); },
+    decimal:     function (obj) { return obj.toString(10); },
+    /* eslint-disable max-len */
+    hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
   },
   defaultStyle: 'decimal',
   styleAliases: {
diff --git a/test/issues/0399.js b/test/issues/0399.js
new file mode 100644
index 00000000..e7fa9d62
--- /dev/null
+++ b/test/issues/0399.js
@@ -0,0 +1,19 @@
+'use strict';
+
+
+var assert = require('assert');
+var yaml = require('../../');
+
+
+test('should properly dump negative ints in different styles', function () {
+  var dump, src = { integer: -100 };
+
+  dump = yaml.dump(src, { styles: { '!!int': 'binary' } });
+  assert.deepEqual(yaml.safeLoad(dump), src);
+
+  dump = yaml.dump(src, { styles: { '!!int': 'octal' } });
+  assert.deepEqual(yaml.safeLoad(dump), src);
+
+  dump = yaml.dump(src, { styles: { '!!int': 'hex' } });
+  assert.deepEqual(yaml.safeLoad(dump), src);
+});