old_contents: # Copyright 2015, Google Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     * Redistributions of source code must retain the above copyright
  # notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above
  # copyright notice, this list of conditions and the following disclaimer
  # in the documentation and/or other materials provided with the
  # distribution.
  #     * Neither the name of Google Inc. nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  """Buildgen transitive dependencies
  
  This takes the list of libs, node_modules, and targets from our
  yaml dictionary, and adds to each the transitive closure
  of the list of dependencies.
  
  """
  
  def get_lib(libs, name):
    return next(lib for lib in libs if lib['name']==name)
  
  def transitive_deps(lib, libs):
    if 'deps' in lib:
      # Recursively call transitive_deps on each dependency, and take the union
      return set.union(set(lib['deps']),
                       *[set(transitive_deps(get_lib(libs, dep), libs))
                         for dep in lib['deps']])
    else:
      return set()
  
  def mako_plugin(dictionary):
    """The exported plugin code for transitive_dependencies.
  
    Each item in libs, node_modules, and targets can have a deps list.
    We add a transitive_deps property to each with the transitive closure
    of those dependency lists.
    """
    libs = dictionary.get('libs')
    node_modules = dictionary.get('node_modules')
    targets = dictionary.get('targets')
  
    for target_list in (libs, targets, node_modules):
      for target in target_list:
        target['transitive_deps'] = transitive_deps(target, libs)
  
    python_dependencies = dictionary.get('python_dependencies')
    python_dependencies['transitive_deps'] = (
        transitive_deps(python_dependencies, libs))
  
new_contents: # Copyright 2015-2016, Google Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     * Redistributions of source code must retain the above copyright
  # notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above
  # copyright notice, this list of conditions and the following disclaimer
  # in the documentation and/or other materials provided with the
  # distribution.
  #     * Neither the name of Google Inc. nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  """Buildgen transitive dependencies
  
  This takes the list of libs, node_modules, and targets from our
  yaml dictionary, and adds to each the transitive closure
  of the list of dependencies.
  
  """
  
  def get_lib(libs, name):
    try:
      return next(lib for lib in libs if lib['name']==name)
    except StopIteration:
      return None
  
  def transitive_deps(lib, libs):
    if lib is not None and 'deps' in lib:
      # Recursively call transitive_deps on each dependency, and take the union
      return set.union(set(lib['deps']),
                       *[set(transitive_deps(get_lib(libs, dep), libs))
                         for dep in lib['deps']])
    else:
      return set()
  
  def mako_plugin(dictionary):
    """The exported plugin code for transitive_dependencies.
  
    Each item in libs, node_modules, and targets can have a deps list.
    We add a transitive_deps property to each with the transitive closure
    of those dependency lists.
    """
    libs = dictionary.get('libs')
    node_modules = dictionary.get('node_modules')
    targets = dictionary.get('targets')
  
    for target_list in (libs, targets, node_modules):
      for target in target_list:
        target['transitive_deps'] = transitive_deps(target, libs)
  
    python_dependencies = dictionary.get('python_dependencies')
    python_dependencies['transitive_deps'] = (
        transitive_deps(python_dependencies, libs))
  
subject: Allow transitive dependencies plugin to process non-existent libs without crashing