text: """module for len modifier."""
  from __future__ import annotations
  from typing import Callable, TYPE_CHECKING
  from .modifier import Modifier
  if TYPE_CHECKING:
      from ..ctx import Ctx
  
  
  class LenModifier(Modifier):
      """Len modifier return the length of value."""
  
      def transform(self, ctx: Ctx) -> int:
          is_str_or_list = isinstance(ctx.val, list) or type(ctx.val) is str
          return len(ctx.val) if is_str_or_list else ctx.val
  