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diff --git a/tools/closure_linter-2.3.4/closure_linter/common/matcher.py b/tools/closure_linter-2.3.4/closure_linter/common/matcher.py
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+#!/usr/bin/env python
+#
+# Copyright 2007 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.
+
+"""Regular expression based JavaScript matcher classes."""
+
+__author__ = ('robbyw@google.com (Robert Walker)',
+              'ajp@google.com (Andy Perelson)')
+
+from closure_linter.common import position
+from closure_linter.common import tokens
+
+# Shorthand
+Token = tokens.Token
+Position = position.Position
+
+
+class Matcher(object):
+  """A token matcher.
+
+  Specifies a pattern to match, the type of token it represents, what mode the
+  token changes to, and what mode the token applies to.
+
+  Modes allow more advanced grammars to be incorporated, and are also necessary
+  to tokenize line by line.  We can have different patterns apply to different
+  modes - i.e. looking for documentation while in comment mode.
+
+  Attributes:
+    regex: The regular expression representing this matcher.
+    type: The type of token indicated by a successful match.
+    result_mode: The mode to move to after a successful match.
+  """
+
+  def __init__(self, regex, token_type, result_mode=None, line_start=False):
+    """Create a new matcher template.
+
+    Args:
+      regex: The regular expression to match.
+      token_type: The type of token a successful match indicates.
+      result_mode: What mode to change to after a successful match.  Defaults to
+        None, which means to not change the current mode.
+      line_start: Whether this matcher should only match string at the start
+        of a line.
+    """
+    self.regex = regex
+    self.type = token_type
+    self.result_mode = result_mode
+    self.line_start = line_start