text: """module for truncate validator."""
  from typing import Any
  from .validator import Validator
  from ..contexts import TransformingContext
  
  
  class TruncateValidator(Validator):
      """Truncate validator truncates value."""
  
      def __init__(self, max_length: int) -> None:
          self.max_length = max_length
  
      def transform(self, context: TransformingContext) -> Any:
          if context.value is None:
              return None
          if context.value.__len__() > self.max_length:
              return context.value[:self.max_length]
          return context.value
  