old_contents: #!/usr/bin/env python
  # -*- Mode: Python; indent-tabs-mode: nil -*-
  # ***** BEGIN LICENSE BLOCK *****
  # Version: MPL 1.1/GPL 2.0/LGPL 2.1
  #
  # The contents of this file are subject to the Mozilla Public License Version
  # 1.1 (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.mozilla.org/MPL/
  #
  # Software distributed under the License is distributed on an "AS IS" basis,
  # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  # for the specific language governing rights and limitations under the
  # License.
  #
  # The Original Code is [Open Source Virtual Machine].
  #
  # The Initial Developer of the Original Code is
  # Adobe System Incorporated.
  # Portions created by the Initial Developer are Copyright (C) 2005-2006
  # the Initial Developer. All Rights Reserved.
  #
  # Contributor(s):
  #
  # Alternatively, the contents of this file may be used under the terms of
  # either the GNU General Public License Version 2 or later (the "GPL"), or
  # the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  # in which case the provisions of the GPL or the LGPL are applicable instead
  # of those above. If you wish to allow use of your version of this file only
  # under the terms of either the GPL or the LGPL, and not to allow others to
  # use your version of this file under the terms of the MPL, indicate your
  # decision by deleting the provisions above and replace them with the notice
  # and other provisions required by the GPL or the LGPL. If you do not delete
  # the provisions above, a recipient may use your version of this file under
  # the terms of any one of the MPL, the GPL or the LGPL.
  #
  # ***** END LICENSE BLOCK *****
  
  
  """Pipes stdin | stdout and extracts a list of all header dependencies to
  a file."""
  
  import re
  import sys
  from sets import Set
  
  _lineExp = re.compile("#(?:line)? ?\d+ \"([^\"<>]+[^/])\"");
  
  deps = Set()
  
  for line in sys.stdin:
      sys.stdout.write(line)
      m = _lineExp.match(line)
      if m:
          deps.add(m.group(1))
  
  if len(sys.argv) != 2:
      raise Exception("Unexpected command line argument.")
  
  outfile = sys.argv[1]
  ostream = open(outfile, "w")
  ostream.write("\n".join(deps))
  ostream.close()
  
new_contents: #!/usr/bin/env python
  # -*- Mode: Python; indent-tabs-mode: nil -*-
  # ***** BEGIN LICENSE BLOCK *****
  # Version: MPL 1.1/GPL 2.0/LGPL 2.1
  #
  # The contents of this file are subject to the Mozilla Public License Version
  # 1.1 (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.mozilla.org/MPL/
  #
  # Software distributed under the License is distributed on an "AS IS" basis,
  # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  # for the specific language governing rights and limitations under the
  # License.
  #
  # The Original Code is [Open Source Virtual Machine].
  #
  # The Initial Developer of the Original Code is
  # Adobe System Incorporated.
  # Portions created by the Initial Developer are Copyright (C) 2005-2006
  # the Initial Developer. All Rights Reserved.
  #
  # Contributor(s):
  #
  # Alternatively, the contents of this file may be used under the terms of
  # either the GNU General Public License Version 2 or later (the "GPL"), or
  # the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  # in which case the provisions of the GPL or the LGPL are applicable instead
  # of those above. If you wish to allow use of your version of this file only
  # under the terms of either the GPL or the LGPL, and not to allow others to
  # use your version of this file under the terms of the MPL, indicate your
  # decision by deleting the provisions above and replace them with the notice
  # and other provisions required by the GPL or the LGPL. If you do not delete
  # the provisions above, a recipient may use your version of this file under
  # the terms of any one of the MPL, the GPL or the LGPL.
  #
  # ***** END LICENSE BLOCK *****
  
  
  """Pipes stdin | stdout and extracts a list of all header dependencies to
  a file."""
  
  import re
  import sys
  
  _lineExp = re.compile("#(?:line)? ?\d+ \"([^\"<>]+[^/])\"");
  
  deps = set()
  
  for line in sys.stdin:
      sys.stdout.write(line)
      m = _lineExp.match(line)
      if m:
          deps.add(m.group(1))
  
  if len(sys.argv) != 2:
      raise Exception("Unexpected command line argument.")
  
  outfile = sys.argv[1]
  ostream = open(outfile, "w")
  ostream.write("\n".join(deps))
  ostream.close()
  
subject: Use builtin set type in dependparser.py (bug 510038 r=dshaffer+)