text: 
  from razdel import tokenize as tokenize_
  
  from .record import Record
  
  
  class Token(Record):
      __attributes__ = ['start', 'stop', 'text']
  
  
  def tokenize(text):
      for token in tokenize_(text):
          yield Token(
              token.start,
              token.stop,
              token.text
          )
  
  
  def find_tokens(text, chunks):
      offset = 0
      for chunk in chunks:
          start = text.find(chunk, offset)
          stop = start + len(chunk)
          yield Token(start, stop, chunk)
          offset = stop
  