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diff --git a/tools/closure_linter-2.3.4/closure_linter/error_check.py b/tools/closure_linter-2.3.4/closure_linter/error_check.py
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+++ b/tools/closure_linter-2.3.4/closure_linter/error_check.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+#
+# Copyright 2011 The Closure Linter Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS-IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+"""Specific JSLint errors checker."""
+
+
+
+import gflags as flags
+
+FLAGS = flags.FLAGS
+
+
+class Rule(object):
+  """Different rules to check."""
+
+  # Documentations for specific rules goes in flag definition.
+  BLANK_LINES_AT_TOP_LEVEL = 'blank_lines_at_top_level'
+  INDENTATION = 'indentation'
+  WELL_FORMED_AUTHOR = 'well_formed_author'
+  NO_BRACES_AROUND_INHERIT_DOC = 'no_braces_around_inherit_doc'
+  BRACES_AROUND_TYPE = 'braces_around_type'
+  OPTIONAL_TYPE_MARKER = 'optional_type_marker'
+
+  # Rule to raise all known errors.
+  ALL = 'all'
+
+  # All rules that are to be checked when using the strict flag. E.g. the rules
+  # that are specific to the stricter Closure style.
+  CLOSURE_RULES = frozenset([BLANK_LINES_AT_TOP_LEVEL,
+                             INDENTATION,
+                             WELL_FORMED_AUTHOR,
+                             NO_BRACES_AROUND_INHERIT_DOC,
+                             BRACES_AROUND_TYPE,
+                             OPTIONAL_TYPE_MARKER])
+
+
+flags.DEFINE_boolean('strict', False,
+                     'Whether to validate against the stricter Closure style. '
+                     'This includes ' + (', '.join(Rule.CLOSURE_RULES)) + '.')
+flags.DEFINE_multistring('jslint_error', [],
+                         'List of specific lint errors to check. Here is a list'
+                         ' of accepted values:\n'
+                         ' - ' + Rule.ALL + ': enables all following errors.\n'
+                         ' - ' + Rule.BLANK_LINES_AT_TOP_LEVEL + ': validates'
+                         'number of blank lines between blocks at top level.\n'
+                         ' - ' + Rule.INDENTATION + ': checks correct '
+                         'indentation of code.\n'
+                         ' - ' + Rule.WELL_FORMED_AUTHOR + ': validates the '
+                         '@author JsDoc tags.\n'
+                         ' - ' + Rule.NO_BRACES_AROUND_INHERIT_DOC + ': '
+                         'forbids braces around @inheritdoc JsDoc tags.\n'
+                         ' - ' + Rule.BRACES_AROUND_TYPE + ': enforces braces '
+                         'around types in JsDoc tags.\n'
+                         ' - ' + Rule.OPTIONAL_TYPE_MARKER + ': checks correct '
+                         'use of optional marker = in param types.\n')
+
+
+def ShouldCheck(rule):
+  """Returns whether the optional rule should be checked.
+
+  Computes different flags (strict, jslint_error, jslint_noerror) to find out if
+  this specific rule should be checked.
+
+  Args:
+    rule: Name of the rule (see Rule).
+
+  Returns:
+    True if the rule should be checked according to the flags, otherwise False.
+  """
+  if rule in FLAGS.jslint_error or Rule.ALL in FLAGS.jslint_error:
+    return True
+  # Checks strict rules.
+  return FLAGS.strict and rule in Rule.CLOSURE_RULES