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diff --git a/third_party/python/yamllint/yamllint/rules/braces.py b/third_party/python/yamllint/yamllint/rules/braces.py
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+++ b/third_party/python/yamllint/yamllint/rules/braces.py
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+# -*- coding: utf-8 -*-
+# Copyright (C) 2016 Adrien Vergé
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Use this rule to control the number of spaces inside braces (``{`` and ``}``).
+
+.. rubric:: Options
+
+* ``min-spaces-inside`` defines the minimal number of spaces required inside
+  braces.
+* ``max-spaces-inside`` defines the maximal number of spaces allowed inside
+  braces.
+* ``min-spaces-inside-empty`` defines the minimal number of spaces required
+  inside empty braces.
+* ``max-spaces-inside-empty`` defines the maximal number of spaces allowed
+  inside empty braces.
+
+.. rubric:: Examples
+
+#. With ``braces: {min-spaces-inside: 0, max-spaces-inside: 0}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: {key1: 4, key2: 8}
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: { key1: 4, key2: 8 }
+
+#. With ``braces: {min-spaces-inside: 1, max-spaces-inside: 3}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: { key1: 4, key2: 8 }
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: { key1: 4, key2: 8   }
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: {    key1: 4, key2: 8   }
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: {key1: 4, key2: 8 }
+
+#. With ``braces: {min-spaces-inside-empty: 0, max-spaces-inside-empty: 0}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: {}
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: { }
+
+#. With ``braces: {min-spaces-inside-empty: 1, max-spaces-inside-empty: -1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: {         }
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: {}
+"""
+
+
+import yaml
+
+from yamllint.rules.common import spaces_after, spaces_before
+
+
+ID = 'braces'
+TYPE = 'token'
+CONF = {'min-spaces-inside': int,
+        'max-spaces-inside': int,
+        'min-spaces-inside-empty': int,
+        'max-spaces-inside-empty': int}
+DEFAULT = {'min-spaces-inside': 0,
+           'max-spaces-inside': 0,
+           'min-spaces-inside-empty': -1,
+           'max-spaces-inside-empty': -1}
+
+
+def check(conf, token, prev, next, nextnext, context):
+    if (isinstance(token, yaml.FlowMappingStartToken) and
+            isinstance(next, yaml.FlowMappingEndToken)):
+        problem = spaces_after(token, prev, next,
+                               min=(conf['min-spaces-inside-empty']
+                                    if conf['min-spaces-inside-empty'] != -1
+                                    else conf['min-spaces-inside']),
+                               max=(conf['max-spaces-inside-empty']
+                                    if conf['max-spaces-inside-empty'] != -1
+                                    else conf['max-spaces-inside']),
+                               min_desc='too few spaces inside empty braces',
+                               max_desc='too many spaces inside empty braces')
+        if problem is not None:
+            yield problem
+
+    elif isinstance(token, yaml.FlowMappingStartToken):
+        problem = spaces_after(token, prev, next,
+                               min=conf['min-spaces-inside'],
+                               max=conf['max-spaces-inside'],
+                               min_desc='too few spaces inside braces',
+                               max_desc='too many spaces inside braces')
+        if problem is not None:
+            yield problem
+
+    elif (isinstance(token, yaml.FlowMappingEndToken) and
+            (prev is None or
+             not isinstance(prev, yaml.FlowMappingStartToken))):
+        problem = spaces_before(token, prev, next,
+                                min=conf['min-spaces-inside'],
+                                max=conf['max-spaces-inside'],
+                                min_desc='too few spaces inside braces',
+                                max_desc='too many spaces inside braces')
+        if problem is not None:
+            yield problem