text: #!/usr/bin/env python
  #
  # Copyright 2007 Neal Norwitz
  # Portions Copyright 2007 Google Inc.
  #
  # 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.
  
  """C++ keywords and helper utilities for determining keywords."""
  
  try:
      # Python 3.x
      import builtins
  except ImportError:
      # Python 2.x
      import __builtin__ as builtins
  
  if not hasattr(builtins, 'set'):
      # Nominal support for Python 2.3.
      from sets import Set as set
  
  TYPES = set('bool char int long short double float void wchar_t unsigned signed'.split())
  TYPE_MODIFIERS = set('auto register const inline extern static virtual volatile mutable'.split())
  ACCESS = set('public protected private friend'.split())
  
  CASTS = set('static_cast const_cast dynamic_cast reinterpret_cast'.split())
  
  OTHERS = set('true false asm class namespace using explicit this operator sizeof'.split())
  OTHER_TYPES = set('new delete typedef struct union enum typeid typename template'.split())
  
  CONTROL = set('case switch default if else return goto'.split())
  EXCEPTION = set('try catch throw'.split())
  LOOP = set('while do for break continue'.split())
  
  ALL = TYPES | TYPE_MODIFIERS | ACCESS | CASTS | OTHERS | OTHER_TYPES | CONTROL | EXCEPTION | LOOP
  
  
  def IsKeyword(token):
      return token in ALL
  
  
  def IsBuiltinType(token):
      if token in ('virtual', 'inline'):
          # These only apply to methods, they can't be types by themselves.
          return False
      return token in TYPES or token in TYPE_MODIFIERS
  