text: """
  Helper classes for parsers.
  """
  import datetime
  import decimal
  import json  # noqa
  import uuid
  
  from django.db.models.query import QuerySet
  from django.utils import timezone
  from django.utils.encoding import force_str
  from django.utils.functional import Promise
  
  from rest_framework.compat import coreapi
  
  
  class JSONEncoder(json.JSONEncoder):
      """
      JSONEncoder subclass that knows how to encode date/time/timedelta,
      decimal types, generators and other basic python objects.
      """
  
      def default(self, obj):
          # For Date Time string spec, see ECMA 262
          # https://ecma-international.org/ecma-262/5.1/#sec-15.9.1.15
          if isinstance(obj, Promise):
              return force_str(obj)
          elif isinstance(obj, datetime.datetime):
              representation = obj.isoformat()
              if representation.endswith('+00:00'):
                  representation = representation[:-6] + 'Z'
              return representation
          elif isinstance(obj, datetime.date):
              return obj.isoformat()
          elif isinstance(obj, datetime.time):
              if timezone and timezone.is_aware(obj):
                  raise ValueError("JSON can't represent timezone-aware times.")
              representation = obj.isoformat()
              return representation
          elif isinstance(obj, datetime.timedelta):
              return str(obj.total_seconds())
          elif isinstance(obj, decimal.Decimal):
              # Serializers will coerce decimals to strings by default.
              return float(obj)
          elif isinstance(obj, uuid.UUID):
              return str(obj)
          elif isinstance(obj, QuerySet):
              return tuple(obj)
          elif isinstance(obj, bytes):
              # Best-effort for binary blobs. See #4187.
              return obj.decode()
          elif hasattr(obj, 'tolist'):
              # Numpy arrays and array scalars.
              return obj.tolist()
          elif (coreapi is not None) and isinstance(obj, (coreapi.Document, coreapi.Error)):
              raise RuntimeError(
                  'Cannot return a coreapi object from a JSON view. '
                  'You should be using a schema renderer instead for this view.'
              )
          elif hasattr(obj, '__getitem__'):
              cls = (list if isinstance(obj, (list, tuple)) else dict)
              try:
                  return cls(obj)
              except Exception:
                  pass
          elif hasattr(obj, '__iter__'):
              return tuple(item for item in obj)
          return super().default(obj)
  