code: def add_suffix (self, specified_name, file_type, prop_set):
          
          assert isinstance(specified_name, basestring)
          assert isinstance(file_type, basestring)
          assert isinstance(prop_set, property_set.PropertySet)
          suffix = b2.build.type.generated_target_suffix (file_type, prop_set)
  
          if suffix:
              return specified_name + '.' + suffix
  
          else:
              return specified_name
docs: Appends the suffix appropriate to 'type/property_set' combination
              to the specified name and returns the result.