text: from typing import Type
  
  from .layout import Layout
  from .src import SrcLayout
  from .standard import StandardLayout
  
  
  _LAYOUTS = {"src": SrcLayout, "standard": StandardLayout}
  
  
  def layout(name):  # type: (str) -> Type[Layout]
      if name not in _LAYOUTS:
          raise ValueError("Invalid layout")
  
      return _LAYOUTS[name]
  