old_contents: # Copyright 2017 Open Source Robotics Foundation, 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.
  
  from ament_package.condition import evaluate_condition
  
  
  class GroupDependency:
      __slots__ = [
          'name',
          'condition',
          'evaluated_condition',
          'members',
      ]
  
      def __init__(self, name, condition=None, members=None):
          self.name = name
          self.condition = condition
          self.members = members
          self.evaluated_condition = None
  
      def __eq__(self, other):
          if not isinstance(other, GroupDependency):
              return False
          return all(getattr(self, attr) == getattr(other, attr)
                     for attr in self.__slots__)
  
      def __str__(self):
          return self.name
  
      def evaluate_condition(self, context):
          """
          Evaluate the condition.
  
          The result is also stored in the member variable `evaluated_condition`.
  
          :param context: A dictionary with key value pairs to replace variables
            starting with $ in the condition.
  
          :returns: True if the condition evaluates to True, else False
          :raises: :exc:`ValueError` if the condition fails to parse
          """
          self.evaluated_condition = evaluate_condition(self.condition, context)
          return self.evaluated_condition
  
      def extract_group_members(self, packages):
          self.members = set()
          for pkg in packages:
              for g in pkg.member_of_groups:
                  assert g.evaluated_condition is not None
              if self.name in [g.name for g in pkg.member_of_groups if g.evaluated_condition]:
                  self.members.add(pkg.name)
  
new_contents: # Copyright 2017 Open Source Robotics Foundation, 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.
  
  from ament_package.condition import evaluate_condition
  
  
  class GroupDependency:
      __slots__ = [
          'name',
          'condition',
          'evaluated_condition',
          'members',
      ]
  
      def __init__(self, name, condition=None, members=None):
          self.name = name
          self.condition = condition
          self.members = members
          self.evaluated_condition = None
  
      def __eq__(self, other):
          if not isinstance(other, GroupDependency):
              return False
          return all(getattr(self, attr) == getattr(other, attr)
                     for attr in self.__slots__)
  
      def __str__(self):
          return self.name
  
      def evaluate_condition(self, context):
          """
          Evaluate the condition.
  
          The result is also stored in the member variable `evaluated_condition`.
  
          :param context: A dictionary with key value pairs to replace variables
            starting with $ in the condition.
  
          :returns: True if the condition evaluates to True, else False
          :raises: :exc:`ValueError` if the condition fails to parse
          """
          self.evaluated_condition = evaluate_condition(self.condition, context)
          return self.evaluated_condition
  
      def extract_group_members(self, packages):
          self.members = set()
          for pkg in packages:
              if self.name in [g.name for g in pkg.member_of_groups]:
                  self.members.add(pkg.name)
  
subject: Revert "consider condition for group membership (#69)" (#70)