code: def get_files(file_tokens, cwd=None):
      
      if not file_tokens:
          return []
  
      token = file_tokens.pop()
      try:
          filename = token.filename
      except AttributeError:
          filename = ''
  
      if cwd:
          input = Input(token.alias, filename, cwd=cwd)
      else:
          input = Input(token.alias, filename)
  
      return [input] + get_files(file_tokens)
docs: Given a list of parser file tokens, return a list of input objects
      for them.